/**
 * 全局事件抛出和侦听类
 * @author zzhanglin
 */
GlobalDispatcher = function()
{
	EventDispatcher.call(this);
};
GlobalDispatcher.prototype = new EventDispatcher();
GlobalDispatcher.prototype.constructor = GlobalDispatcher ;

/**
 * 获取此类的实例 ，单例
 * @returns
 */
GlobalDispatcher.getInstance = function(){
	if(!GlobalDispatcher._instance){
		GlobalDispatcher._instance = new GlobalDispatcher();
	}
	return GlobalDispatcher._instance;
};

